PLATE IV. 



Anatomy of the Dokcasiinae. 



Figs. 1-6. — Fulliul anianti seen fiom below, showing the arrangement of the 

 piUmonary veins, with tlie mantle-edge and left body-lobes above, the pericardium 

 and kidney below, and the rectum on the left side. (Somewhat diagrammatic.) 

 , Fig. 1. — Trigonephrus globulus (Miill.). 



,, 2. — T . imrphyrostoma (M. & P.). 

 ,, 3. — T. namaquensh (M. & P.). 

 ,, 4.— T. lucanuR (Miill.). 

 ,, 5. — Dorcasia coagtiliim (v. Mts.). 

 ., 6. — D. alc.vandri, var. rotundatu, Mouss. 

 Figs. 7 & 8. — Dorsal views of hiiccul mas.^, showing the end of the radula-sac 

 and the opening of the oesophagus. (Natural size.) 



Fig. 7. — Trigoieplinis globuliDi (Miill.). 

 ,, 8. — T. namaqncnsis (M. iV P.). 

 Figs. 9 -10. — Eepresentative teeth from the radida (seen from above). 

 Fig. 9. — Trlgonephruit globaltif: (Miill.) x loO. 

 ,, 10.— T. rosaceus (Miill.) x 150. 

 ,, U.—T.porphyrostoma (M. & P.) x 150. 

 ,, 12. — T. namaqiiensis (M. & P.) x 150. 

 ,, 13. — T. lucanus (Miill.) x 175. 

 ,, 14. — Dorcasia coagulum (v. Mts.) x 250. 

 ,, 15. — D. rogersi, nov. x 250. 

 ,, IG. — Z). alexandri, var. rottindata, Mouss. x 250. 

 Figs. 17-24. — Anterior views oijaw. 



Fig. 17. — Trigonephrus globulus (Miill.) x 7-5. 

 ,, 18.-2'. rosaceus (Miill.) x 7-5. 

 ., l^.—T.porphyrosioma (M. & P.) x 7-5. 

 ,, 20. — T. namaquensis (M. & P.) x 7"5. 

 ,, 21. — T. lucanus (Miill.) white var. x 7-5. 

 ,, 22. — Dorcasia coagulum (v. Mts.) x 10. 

 ,, 23. — D. rogersi, nov. x 10. 

 ,, 24. — D. alexandri, var. rotundata, Mouss. x 10. 

 Figs. 25 it 2C>.—Digestife stjsteDt, seen from above, after the intestine and 

 roetum, with the anterior division of the liver, have been turned over to the left. 

 Fig. 2b.— 'Trigonephrus porphyrostoma (M. & I*.) x 1. 

 ,, 26. — Dorcasia coagulum (v. Mts.) x 2. 

 Figs. 27-30.— Part of the wall of the penis, seen from within. 

 Fig. 27. — Trigonephras globulus (Miill.) x 6. 

 ,, 2S.—T. porphyrostoma (M. & P.) x 5. 

 ,, 29.— T. lucanus (Miill.) x 6. 

 ,, 30. — Dorcasia coagulum (v. Mts.) x 6. 



